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Table V-A.22: Maintenance Standards - Permeable Pavement (continued) <br />Recommended Frequency a <br />Condition when Maintenance is Needed <br />Component <br />(Standards) <br />Action Needed (Procedures) <br />Inspection <br />Routine Maintenance <br />• Combined pressure wash and vacuum system calibrated to not dislodge wearing course aggregate. <br />• Hand held pressure washer or power washer with rotating brushes <br />• Pure vacuum sweepers <br />Note: If the annual/biannual routine maintenance standard to clean the pavement surface is conducted using <br />equipment from the list above, corrective maintenance may not be needed. <br />• Assess the overall performance of the pavement system during a rain event. If water runs off the pavement <br />and/or there is ponding then see above. <br />A <br />Sediment present at the surface of the pave - <br />ment <br />• Determine source of sediment loading and evaluate whether or not the source can be reduced/eliminated. If <br />the source cannot be addressed, consider increasing frequency of routine cleaning (e.g., twice per year <br />instead of once per year). <br />• Sidewalks: Use a stiff broom to remove moss in the summer when it is dry <br />Summer <br />Moss growth inhibits infiltration or poses slip <br />safety hazard <br />• Parking lots and roadways: Pressure wash, vacuum sweep, or use a combination of the two for cleaning <br />moss from pavement surface. May require stiff broom or power brush in areas of heavy moss. <br />• Fill potholes or small cracks with patching mixes <br />• Large cracks and settlement may require cutting and replacing the pavement section. Replace in -kind where <br />A <br />Major cracks or trip hazards and concrete <br />feasible. Replacing porous asphalt with conventional asphalt is acceptable if it is a small percentage of the <br />spalling and raveling <br />total facility area and does not impact the overall facility function. <br />• Take appropriate precautions during pavement repair and replacement efforts to prevent clogging of adjacent <br />porous materials <br />Clean pavement surface using one or a combination of the following methods: <br />• Remove sediment, debris, trash, vegetation, and other debris deposited onto pavement (rakes and leaf <br />blowers can be used for removing leaves) <br />• Vacuum/sweep permeable paving installation using: <br />A or B <br />None (routine maintenance) <br />o Walk -behind vacuum (sidewalks) <br />o High efficiency regenerative airorvacuum sweeper (roadways, parking lots) <br />Interlocking concrete <br />o ShopVac or brush brooms (small areas) <br />paver blocks and <br />Note: Vacuum settings may have to be adjusted to prevent excess uptake of aggregate from paver openings <br />aggregate pavers <br />orjoints. Vacuum surface openings in dry weather to remove dry, encrusted sediment. <br />• Review the overall performance of the facility (note that small clogged areas may not reduce overall per- <br />formance of facility) <br />Surface is clogged: Ponding on surface or water <br />• Test the surface infiltration rate using ASTM C1701 as a corrective maintenance indicator. Perform one test <br />Ab <br />flows off the permeable pavement surface dur- <br />per installation, up to 2,500 square feet. Perform an additional test for each additional 2,500 square feet up to <br />ing a rain event (does not infiltrate) <br />15,000 square feet total. Above 15,000 square feet, add one test for every 10,000 square feet. <br />• If the results indicate an infiltration rate of 10 inches per hour or less, then perform corrective maintenance to <br />restore permeability. <br />2019 Stormwater Management Manual for Western Washington <br />Volume V - AppendixA - Page 1026 <br />